2 sticks butter, softened
2 c. light brown sugar, firmly packed
1/2 c. light corn syrup
1 tsp. salt
2 tsp. baking soda
1 tsp. vanilla
6 to 8 qt. popped popcorn

Mix butter, brown sugar, corn syrup and salt in saucepan. Stir over low heat until butter is melted. Bring to boil, stirring constantly. Boil for 5 minutes. Remove from heat. Add soda and vanilla. Pour mixture over popcorn. Bake at 250 degrees for 1 hour, stirring every 15 minutes. Pour onto waxed paper, underlined with newspaper. Cool and store in tightly covered container.